Malicious PDF — malware analysis report

Static analysis result for SHA-256 67919f4685d5614c…

MALICIOUS

PDF

90.3 KB Created: 2021-09-02 12:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59867678dc4a11a5da4349745903a854 SHA-1: e8b79ef8aeec66d72f739de7a6c8a188e83dc7d0 SHA-256: 67919f4685d5614c27f24847ab102cd8a620eae44786456d5200c71c4e26422f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The primary function appears to be redirecting users to potentially malicious or phishing sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://intrinhgia.com/admin/webroot/upload/image/files/xasedufikitakinejatupi.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/bevekalifet.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/kapetevefe.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/dulilasovatavokize.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6c4r6uiiu7cgnnvs5jhgorlepj/18776388782.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad12b1491---84686265253.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160965dc55f7a3---6972048364.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16263468278411.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/2333656869.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/bb265c131f6d0dfdabc07140ac9d401d/nafavigaxijepugojogen.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/ruvebubevewaguxuzuvibedit.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/da9236b5c71fc88581b3f87adaa29ae3/kazujiwekizenoxazukikom.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/bapogusexavatimaro.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070983f64da4---42418042682.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zizidipejuzubufojajisu.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/jalaxiwa.pdfIn PDF document text
    • http://esejsc.com/upload/files/32555317267.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/sipokagew.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210708_3C6C3100728970E4.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/40239579074.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/rasutonid.pdfIn PDF document text
    • https://agatanorek.com/files/file/54491987817.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/besekipupanukafo.pdfIn PDF document text
    • http://belst.by/upload/file/kusugejekarewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=confessions+of+an+economic+hit+man+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 11004 bytes
SHA-256: c3aab2399e133a1a1fb6779cd2c07fc95ef3c64d8563e944329c022ceb277e0e
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 19404 bytes
SHA-256: 018b7ea9386bd59daefe77e87443d18ae787ee3a946c2b810b2d0f597444b942
font_02_sfnt_off000142ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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